WO2020022399A1 - Station de base et procédé de commande de celle-ci - Google Patents

Station de base et procédé de commande de celle-ci Download PDF

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Publication number
WO2020022399A1
WO2020022399A1 PCT/JP2019/029093 JP2019029093W WO2020022399A1 WO 2020022399 A1 WO2020022399 A1 WO 2020022399A1 JP 2019029093 W JP2019029093 W JP 2019029093W WO 2020022399 A1 WO2020022399 A1 WO 2020022399A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
base station
communication
communication signal
mobile station
Prior art date
Application number
PCT/JP2019/029093
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English (en)
Japanese (ja)
Inventor
忍 藤本
Original Assignee
京セラ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to JP2020532449A priority Critical patent/JP7055207B2/ja
Publication of WO2020022399A1 publication Critical patent/WO2020022399A1/fr
Priority to US17/155,154 priority patent/US11503444B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a base station for an intelligent transportation system and a control method thereof.
  • Non-Patent Document 1 specifies a standard for a wireless communication system having a base station installed on the roadside and a mobile station mounted on a vehicle.
  • Such a wireless communication system performs road-to-vehicle communication for transmitting and receiving communication signals between a base station and a mobile station, and inter-vehicle communication for transmitting and receiving communication signals between mobile stations.
  • the communication signal communication packet
  • only the broadcast address is specified as the destination address (destination MAC address). That is, the road-vehicle communication and the vehicle-vehicle communication are performed by broadcast communication.
  • the base station according to the first feature is a base station installed around a road.
  • the base station receives a first communication signal broadcast from a mobile station mounted on a vehicle, and an antenna weight that forms a beam for the mobile station based on the received first communication signal.
  • the method according to the second feature is a method of controlling a base station installed around a road.
  • the method includes receiving a first communication signal broadcast from a mobile station mounted on a vehicle, and calculating an antenna weight for forming a beam for the mobile station based on the received first communication signal. And transmitting a second communication signal to the mobile station by beamforming using the calculated antenna weight.
  • FIG. 1 is a diagram illustrating an example of an overall configuration of a wireless communication system according to an embodiment.
  • FIG. 2 is a diagram illustrating an example of a communication protocol stack in the wireless communication system according to the embodiment.
  • FIG. 2 is a diagram illustrating an example of a road-vehicle communication period in the wireless communication system according to the embodiment.
  • FIG. 2 is a diagram illustrating a configuration example of a base station according to the embodiment.
  • FIG. 3 is a diagram illustrating a configuration example of a mobile station according to the embodiment. It is a flowchart which shows the operation example of the base station which concerns on embodiment.
  • a base station transmits a fixed transmission along an extension direction of a specific road so that a mobile station mounted on a vehicle traveling on the specific road can receive a communication signal from the base station. It is assumed that a communication signal is transmitted by directivity.
  • the present disclosure provides a base station capable of improving communication quality in road-to-vehicle communication and a control method thereof.
  • FIG. 1 is a diagram illustrating an example of the overall configuration of a wireless communication system 1 according to the present embodiment.
  • the wireless communication system 1 is a wireless communication system based on the standard of Non-Patent Document 1.
  • the wireless communication system 1 includes a plurality of vehicles 100 and a plurality of base stations 200.
  • vehicles 100A and 100B are illustrated as a plurality of vehicles 100
  • base stations 200A and 200B are illustrated as a plurality of base stations 200.
  • vehicle 100 is exemplified by a car such as a normal car or a mini car, but may be any vehicle that runs on a road, such as a motorcycle (motorcycle).
  • Each vehicle 100 is equipped with a mobile station 150 that performs wireless communication in a CSMA (Carrier Sense Multiple Multiple Access) system.
  • the mobile station 150 may be referred to as a vehicle-mounted device or a vehicle-mounted communication device.
  • Each base station 200 is installed near the road. Each base station 200 is connected to the central device 400 via a communication line.
  • the base station 200 may be installed, for example, at each intersection on a general road, or may be installed on the road side of an expressway.
  • the base station 200 may be referred to as a roadside device or a roadside communication device.
  • the base station 200A is installed on the traffic light 300 or its support.
  • the base station 200A operates in cooperation with the traffic light 300.
  • the base station 200A may transmit a communication signal including information on the traffic signal 300 (light color switching information and the like) as application data. Details of the base station 200 will be described later.
  • the wireless communication system 1 includes road-to-vehicle communication for transmitting and receiving communication signals between the base station 200 and the mobile station 150 (vehicle 100), and inter-vehicle communication for transmitting and receiving communication signals between the mobile stations 150 (vehicles 100). I do. Further, the wireless communication system 1 may further perform inter-road communication for transmitting and receiving communication signals between the base stations 200. Broadcast wireless communication is used for each of the road-vehicle communication, the vehicle-vehicle communication, and the road-road communication. Specifically, for a communication signal (communication packet), only a broadcast address is specified as a destination address (destination MAC address).
  • Each base station 200 is connected to the central device 400 via a communication line.
  • a vehicle sensor installed on the road side may be connected to the central device 400 via a communication line.
  • Central device 400 receives, from each base station 200, vehicle information (application data) including the position and speed of vehicle 100 received from mobile station 150 by base station 200.
  • the central device 400 may further receive vehicle sensing information from roadside sensors installed on each road.
  • the central device 400 collects and processes various types of traffic information based on the received information, and integrates and manages a road traffic system. For example, the central device 400 transmits a control command to instruct the traffic signal 300 to switch the lamp color, or transmits traffic information (application data) including traffic congestion information and the like to the base station 200.
  • FIG. 2 is a diagram illustrating an example of a communication protocol stack in the wireless communication system 1 according to the present embodiment.
  • the communication protocol stack shown in FIG. 2 is applied to each of road-to-vehicle communication, vehicle-to-vehicle communication, and road-to-road communication.
  • each layer of the communication protocol stack is defined based on the OSI reference model.
  • the communication protocol stack includes layer 1 (L1, physical layer: Physical Layer), layer 2 (L2, data link layer: Data Link Layer), inter-vehicle / road-vehicle shared communication control information (IVC-RVC: Inter-Vehicle Communication-). It has a Road to Vehicle Communication layer and a layer 7 (L7, application layer: Application Layer).
  • Layer 1 operates according to the physical layer defined in IEEE 802.11.
  • Layer 2 includes a MAC (Medium Access Control) sublayer and an LLC (Logical Link Control) sublayer.
  • the MAC sublayer may be simply referred to as the MAC layer, and the LLC sublayer may be simply referred to as the LLC layer.
  • the MAC layer uses the CSMA / CA system as communication control between the mobile stations 150.
  • the MAC layer performs frame control and broadcast (broadcast) as wireless channel communication management.
  • the LLC layer provides a connectionless service to perform packet transmission between higher layer entities.
  • Layer 7 provides communication control means for the application AP.
  • the application AP gives the application data (traffic information, vehicle information, etc.) stored in the transmitted communication signal to the layer 7, and acquires the application data stored in the received communication signal from the layer 7.
  • application data (traffic information, vehicle information, etc.) provided to the mobile station 150 or another base station is obtained and generated, and the application data is transmitted by the layer 7 communication.
  • An application transmitted by the control means is included.
  • application data (traffic information, vehicle information, etc.) provided to another mobile station or the base station 200 is obtained and generated, and the application data is transmitted by the layer 7.
  • An application transmitted by the control means is included.
  • FIG. 3 is a diagram illustrating an example of a road-to-vehicle communication period in the wireless communication system 1 according to the present embodiment.
  • the base station 200 and the mobile station 150 basically perform communication at a period of 100 ms.
  • the base station 200 secures its own transmission time by notifying the surrounding mobile station 150 of the transmission time and the road-to-vehicle communication period information (the number of transfers / the road-to-vehicle communication period length) as its own transmission information.
  • the road-to-vehicle communication period information the number of transfers / the road-to-vehicle communication period length
  • synchronization accuracy of ⁇ 16 ⁇ s or less is maintained between the base stations 200.
  • the mobile station 150 performs time synchronization based on the transmission time received from the base station 200, and stops transmission based on the road-to-vehicle communication period information, thereby transmitting at a timing other than the transmission period of the base station 200. .
  • 16 ⁇ s is set as a control unit time (unit), and the control cycle is composed of 6250 units.
  • the maximum value of the number of road-to-vehicle communication periods that can be set in one control cycle is “16”, and they are arranged at intervals of 390 units (6240 ⁇ s) from the beginning of the control cycle.
  • the maximum value of the road-vehicle communication period length that can be set is 189 units (3024 ⁇ s).
  • FIG. 4 is a diagram illustrating a configuration example of the base station 200 according to the present embodiment.
  • the base station 200 includes a wireless communication unit 210, a wired communication unit 220, and a control unit 230.
  • the wired communication unit 220 is used for communication with the central device 400. Further, the wired communication unit 220 may be connected to the traffic light 300.
  • the wireless communication unit 210 is used for wireless communication with the mobile station 150 (road-vehicle communication) and wireless communication with another base station (road-road communication). In the present embodiment, a case where the wireless communication unit 210 is used for road-to-vehicle communication will be described.
  • the wireless communication unit 210 includes an antenna 211, an array antenna 212, a receiving unit 213, and a transmitting unit 214.
  • the antenna 211 is an omnidirectional antenna or a directional antenna.
  • a plurality of antennas may be provided as the antenna 211.
  • the antenna 211 is a directional antenna, the antenna 211 has directivity along the extension direction of a road around which the base station 200 is provided.
  • the array antenna 212 includes a plurality of antenna elements.
  • the array antenna 212 is used for adaptive array control (beamforming control) for variably controlling the directivity. Beamforming involves directing nulls to interfering waves in addition to directing the beam to the desired waves.
  • the array antenna 212 may be a linear array type in which a plurality of antenna elements are arranged in a straight line, or a planar array type in which a plurality of antenna elements are arranged in a plane (two-dimensional). Alternatively, a circular array type in which a plurality of antenna elements are arranged in a circular shape may be used.
  • the receiving unit 213 receives a communication signal (radio signal) from the mobile station 150 under the control of the control unit 230.
  • Receiving section 213 receives a communication signal from mobile station 150 via array antenna 212, converts the received communication signal into a baseband signal, and outputs the signal to control section 230.
  • receiving section 213 is provided corresponding to each antenna element of array antenna 212, and a weighting section that performs weighting using antenna weights, and a combining section that combines and outputs a signal weighted for each antenna element.
  • the antenna weight is a weight coefficient for adjusting the phase and amplitude of a signal.
  • the control unit 230 performs various controls in the base station 200.
  • the control unit 230 includes at least one processor and at least one memory.
  • the control unit 230 temporarily stores the vehicle information (application data) included in the communication signal received by the receiving unit 213 from the mobile station 150, and transfers the vehicle information to the central device 400 via the wired communication unit 220.
  • the control unit 230 also temporarily stores traffic information (application data) and the like received by the wired communication unit 220 from the central device 400 and controls the communication unit 214 to transmit a communication signal including the traffic information.
  • the control unit 230 calculates the antenna weight based on the communication signal received by the receiving unit 213.
  • the control unit 230 calculates an antenna weight for each antenna element using a control algorithm based on a predetermined criterion.
  • the predetermined criterion may be a minimum mean square error (MMSE) criterion.
  • Control section 230 calculates the antenna weight such that the difference (error signal) between the replica (reference signal) of the desired wave and the actual array output signal is minimized.
  • the antenna weight may be calculated using a pilot signal defined in IEEE 802.11 as a reference signal. Instead of using such an existing pilot signal, a new reference signal for calculating the antenna weight may be introduced.
  • the predetermined reference may be a constant envelope (CMA: Constant @ Modulus @ Algorithm) reference.
  • CMA Constant @ Modulus @ Algorithm
  • the transmission unit 214 transmits a communication signal (wireless signal) to the mobile station 150 under the control of the control unit 230.
  • Transmitting section 214 converts the baseband signal input from control section 230 to a wireless signal and outputs the wireless signal.
  • Transmitting section 214 is a distribution section that distributes the baseband signal input from control section 230 for each antenna element, and a weighting section that is provided corresponding to each antenna element of array antenna 212 and performs weighting using antenna weights.
  • Transmission section 214 operates in one of a first transmission mode for transmitting a communication signal with omnidirectional or fixed transmission directivity and a second transmission mode for transmitting a communication signal by beamforming.
  • first transmission mode transmission section 214 converts the baseband signal input from control section 230 into a radio signal and transmits the radio signal from antenna 211.
  • second transmission mode transmitting section 214 converts the baseband signal input from control section 230 into a wireless signal and transmits the wireless signal from array antenna 212.
  • control section 230 provides transmitting section 214 with the antenna weight used at the time of reception in receiving section 213 as a transmission antenna weight.
  • the same carrier wave frequency is used for transmission from mobile station 150 to base station 200 (upward direction) and transmission from base station 200 to mobile station 150 (downstream direction).
  • the same antenna weight for uplink and downlink.
  • the upstream communication signal is referred to as a first communication signal
  • the downstream communication signal is referred to as a second communication signal.
  • each mobile station 150 in a predetermined area transmits a second communication signal from the base station 200 by transmitting the second communication signal with omnidirectional or fixed transmission directivity. Can be received.
  • the communication quality in the specific mobile station 150 can be improved by transmitting the second communication signal by transmission beamforming.
  • the second transmission mode there is a possibility that a null is directed to a mobile station other than the specific mobile station 150 and communication quality is degraded.
  • the control unit 230 basically sets the first transmission mode, and transmits the second communication signal from the transmission unit 214 according to the non-directionality or the fixed transmission directivity.
  • the base station 200 transmits the second communication signal including the application data for the vehicle 100 of the predetermined type
  • the communication quality of the mobile station 150 mounted on the vehicle 100 of the predetermined type is improved.
  • the base station 200 transmits a second communication signal including application data for a bus
  • the communication quality in the mobile station 150 mounted on the vehicle 100 that is traveling emergency is improved. Is preferred. Therefore, when the base station 200 determines that the mobile station 150 is mounted on the vehicle 100 that is traveling in an emergency, based on the first communication signal received from the mobile station 150, the base station 200 transmits the second transmission mode (transmission beam). By applying (forming), the communication quality of the mobile station 150 mounted on the vehicle 100 that is running in an emergency is improved.
  • the control unit 230 includes a control unit 230 that calculates an antenna weight for forming a beam with respect to the mobile station 150, and a transmission unit 214 that transmits a second communication signal to the mobile station 150 by transmission beamforming using the calculated antenna weight.
  • the second communication signal transmitted by the base station 200 includes a broadcast address as a destination address (destination MAC address). As described above, by applying the transmission beamforming to the broadcasted second communication signal, the communication quality in the road-to-vehicle communication performed by the broadcast can be improved.
  • the control unit 230 switches from the first transmission mode to the second transmission mode (transmission beamforming). And the second communication signal may be transmitted in the second transmission mode.
  • the first communication signal has a field for storing information indicating the type of the vehicle 100 on which the mobile station 150 of the transmission source is mounted or a flag indicating whether the type of the vehicle 100 is a predetermined type.
  • Control unit 230 determines whether the type of vehicle 100 is a predetermined type based on the field.
  • the control unit 230 changes from the first transmission mode to the second transmission mode (transmission (Beam forming), and the second communication signal may be transmitted in the second transmission mode.
  • the first communication signal has a field for storing information indicating the state of the vehicle 100 on which the mobile station 150 of the transmission source is mounted or a flag indicating whether the state of the vehicle 100 is in a predetermined state.
  • Control unit 230 determines whether or not vehicle 100 is in a predetermined state based on the field.
  • the number of beams that the base station 200 can form is limited.
  • the number of beams that can be formed in one transmission may be one.
  • the control unit 230 is configured such that the receiving unit 213 receives a plurality of first communication signals including predetermined vehicle information from a plurality of mobile stations 150 corresponding to the plurality of vehicles 100 within a predetermined time, and the plurality of mobile stations When the number of 150 is equal to or more than a threshold (for example, 2), the mode may be switched from the second transmission mode to the first transmission mode.
  • the predetermined time may be a time from when the receiving unit 213 receives the first communication signal including the predetermined vehicle information from one mobile station 150 until a predetermined time elapses, or a predetermined time interval (for example, (Every minute).
  • the control unit 230 switches from the second transmission mode when receiving the first communication signal from another bus. Switch to the first transmission mode. Thereby, each bus can appropriately receive the second communication signal from the base station 200.
  • the control unit 230 receives the first communication signal from one emergency traveling vehicle and applies the second transmission mode, and receives the first communication signal from another emergency traveling vehicle. Switch from the second transmission mode to the first transmission mode. This allows each emergency traveling vehicle to appropriately receive the second communication signal from base station 200.
  • FIG. 5 is a diagram illustrating a configuration example of the mobile station 150 according to the present embodiment. As shown in FIG. 5, the mobile station 150 has a wireless communication unit 110 and a control unit 120.
  • the wireless communication unit 110 is used for wireless communication with the base station 200 (road-vehicle communication) and wireless communication with other mobile stations (vehicle-to-vehicle communication).
  • the wireless communication unit 110 has an antenna 111, a receiving unit 112, and a transmitting unit 113.
  • the receiving unit 112 receives a wireless signal under the control of the control unit 120.
  • Receiving section 112 converts a radio signal received by antenna 111 to a baseband signal (received signal) and outputs the signal to control section 120.
  • the transmission unit 113 transmits a radio signal under the control of the control unit 120.
  • Transmission section 113 converts the baseband signal (transmission signal) output from control section 120 into a radio signal and transmits the radio signal from antenna 111.
  • the receiving unit 112 performs carrier sense. Specifically, the receiving unit 112 constantly monitors the reception level of the predetermined carrier frequency, does not perform wireless transmission when the reception level is equal to or higher than a certain threshold, and only transmits when the reception level is lower than the threshold. 113 performs wireless transmission.
  • the control unit 120 performs various controls in the mobile station 150.
  • the control unit 120 includes at least one processor and at least one memory.
  • the control unit 120 broadcasts a communication signal including vehicle information (application data) including the current position, direction, speed, and the like of the vehicle 100 (the mobile station 150) to the outside via the wireless communication unit 110.
  • the control unit 120 performs safe driving support control for avoiding a right-right collision, a head-on collision, and the like based on vehicle information (application data) included in a communication signal received by the reception unit 112 from another vehicle. be able to.
  • control unit 120 when the receiving unit 112 receives the allocation information of the time slot broadcast by the base station 200, the control unit 120 generates a communication frame including the allocation information, broadcasts a radio signal of the communication frame, and performs other mobile communication. Transfer the assignment information to the station. Further, control section 120 performs wireless transmission by the carrier sense scheme during a time period in which base station 200 that has transmitted the allocation information does not transmit.
  • the control unit 120 when the type of the vehicle 100 on which the mobile station 150 is mounted is a predetermined type (for example, a bus), the control unit 120 indicates that the type of the vehicle 100 is the predetermined type.
  • the transmitting unit 113 may be controlled to transmit a communication signal including information.
  • the control unit 120 includes predetermined vehicle information indicating that the state of the vehicle 100 is in the predetermined state when the state of the vehicle 100 on which the mobile station 150 is mounted is in a predetermined state (for example, during emergency driving).
  • the transmitting unit 113 may be controlled to transmit a communication signal.
  • FIG. 6 is a flowchart illustrating an operation example of the base station 200 according to the present embodiment.
  • step S1 the control unit 230 sets the first transmission mode.
  • the control unit 230 transmits the second communication signal at every predetermined assigned time slot (inter-vehicle-to-vehicle communication period) with omnidirectional or fixed transmission directivity.
  • step S2 the control unit 230 checks whether the receiving unit 213 has received the first communication signal from the mobile station 150.
  • control section 230 calculates the antenna weight based on the communication signal received by receiving section 213 in step S3.
  • Receiving section 213 performs reception processing including weighting with an antenna weight, and outputs a received signal to control section 230.
  • step S4 the control unit 230 determines that the type of the vehicle 100 on which the mobile station 150 that is the source of the first communication signal is mounted is a predetermined type (for example, bus) in the received first communication signal (received signal). It is confirmed whether or not predetermined vehicle information indicating that there is, or predetermined vehicle information indicating that the state of the vehicle 100 is in a predetermined state (for example, emergency traveling) is included.
  • a predetermined type for example, bus
  • step S1 If the received first communication signal does not include the predetermined vehicle information (step S4: NO), in step S1, control unit 230 maintains the first transmission mode. On the other hand, when the received first communication signal includes the predetermined vehicle information (step S4: YES), in step S5, control unit 230 switches from the first transmission mode to the second transmission mode. Thereafter, the process returns to step S2. In the case of the second transmission mode, the control unit 230 transmits the second communication signal by transmission beamforming using the antenna weight calculated in step S3 for each predetermined allocation time slot (road-vehicle communication period). .
  • the base station 200 is configured based on the receiving unit 213 that receives the first communication signal broadcasted from the mobile station 150 mounted on the vehicle 100 and the received first communication signal. , A control unit 230 for calculating an antenna weight for forming a beam for the mobile station 150, and a transmission unit 214 for transmitting a second communication signal to the mobile station 150 by transmission beamforming using the calculated antenna weight. . Thereby, communication quality in road-to-vehicle communication performed by broadcast can be improved.
  • the towing method may be a physical towing method in which the vehicle 100 is connected by a cable or the like, or may be an electronic towing method in which the vehicle 100 is towed by radar or communication. In such traction, communication between vehicles (inter-vehicle communication) may be performed in order to appropriately maintain traction.
  • the base station 200 performs transmission beamforming on the towed vehicle when a train of towed vehicles and towed vehicles is specified.
  • the mobile station 150 transmits a first communication signal including an information element indicating whether or not one or more towed vehicles are being towed by the towed vehicle.
  • the information element may be a 1-bit flag indicating presence / absence of towing.
  • the mobile station 150 transmits a first communication signal including an information element indicating whether or not one or more towed vehicles are towed when the vehicle 100 on which the mobile station 150 is mounted is a towed vehicle.
  • the information element may be a 1-bit flag indicating whether or not the vehicle 100 is a towing vehicle.
  • the mobile station 150 may transmit a first communication signal including an information element indicating whether or not the vehicle 100 is being towed by the towed vehicle.
  • the information element may be a 1-bit flag indicating whether or not the vehicle 100 is a towed vehicle.
  • the information element may be a 1-bit flag indicating whether the vehicle 100 is a towing vehicle or a towed vehicle.
  • the mobile station 150 is an information element that indicates which vehicle the host vehicle 100 is in the train including the towing vehicle and the towed vehicle. May be transmitted.
  • the information element may be represented by both eyes and may be represented by xx / xx.
  • xx is the number of vehicles 100 forming the vehicle train.
  • the control unit 230 of the base station 200 Based on information (information elements) included in the first communication signal, transmission beamforming is applied to some of the plurality of mobile stations 150.
  • the predetermined time may be a time from when the receiving unit 213 receives the first communication signal from one mobile station 150 until a predetermined time elapses, or at a predetermined time interval (for example, every one minute). It may be.
  • the control unit 230 of the base station 200 determines whether the plurality of tow vehicles 100 and one or more tow vehicles 100 towed by the tow vehicles 100 are plural. When it is determined that the mobile station 150 is included in the towing vehicle 100, transmission beamforming is applied to the mobile station 150 mounted on the towing vehicle 100.
  • the control unit 230 performs transmission beamforming on the towing vehicle, so that appropriate transmission beamforming is performed in a scenario where the towing vehicle exists. It can be performed.
  • the base station 200 installed on the roadside is an antenna / body integrated base station, but may be an antenna / body separated base station.
  • the antenna portion of the base station 200 may be installed around the road, the main body portion of the base station 200 may be installed away from the road, and the antenna portion and the main body portion may be connected via a cable.
  • the communication protocol of the embodiment of the system described above is described in conformity with ARIB @ T109, but may be based on 3GPP V2X or a method such as a wireless LAN.
  • the base station 200 may be configured as an all-in-one that can support all of these communication standards.
  • the broadcast may be MBMS (Multimedia Broadcast Multicast Service).
  • SC-PTM single cell point-to-multipoint

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  • Mobile Radio Communication Systems (AREA)
  • Traffic Control Systems (AREA)

Abstract

La présente invention concerne une station de base installée à proximité d'une route comprenant : une unité de réception pour recevoir un premier signal de communication diffusé à partir d'une station mobile montée dans un véhicule; une unité de commande pour calculer un poids d'antenne pour former un faisceau par rapport à la station mobile sur la base du premier signal de communication reçu; et une unité de transmission pour transmettre un second signal de communication à la station mobile au moyen d'une formation de faisceau de transmission à l'aide du poids d'antenne calculé.
PCT/JP2019/029093 2018-07-26 2019-07-24 Station de base et procédé de commande de celle-ci WO2020022399A1 (fr)

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JP2020532449A JP7055207B2 (ja) 2018-07-26 2019-07-24 基地局及びその制御方法
US17/155,154 US11503444B2 (en) 2018-07-26 2021-01-22 Base station and control method thereof possible to improve communication quality in road-to-vehicle communication

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JP2018140416 2018-07-26
JP2018-140416 2018-07-26

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4307272A4 (fr) * 2021-03-10 2024-04-10 Nissan Motor Co., Ltd. Dispositif et procédé de traitement d'informations
EP4307731A4 (fr) * 2021-03-10 2024-04-10 Nissan Motor Co., Ltd. Dispositif de traitement d'informations et procédé de traitement d'informations
EP4307732A4 (fr) * 2021-03-10 2024-04-24 Nissan Motor Co., Ltd. Dispositif de traitement d'informations et procédé de traitement d'informations

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